Question

所以，我一直在研究一个django项目（使用djagno 1.11），我看到一个非常酷的聊天功能，有人嘲笑（使用django 2.0）here和他们的git repo here 。我可以在自己的应用程序中按照指南重新创建整个项目，但是当我将它添加到我自己的应用程序时，我遇到了麻烦。我当前的应用程序使用bootstrap并有javascript将项目添加到购物车和其他类似的东西，我想知道这是否妨碍了。其他的JavaScript仍然有效，新的JavaScript不会'。我收到了你的基本错误：

未捕获的ReferenceError：$未定义

当我谷歌搜索它时，我发现这意味着在定义之前正在使用某些东西。我在python上很不错，但是javascript的极端新手，所以我不确定发生了什么。深入了解错误，我看到以下内容：

    <script src="https://project.s3.amazonaws.com/static/js/chat.js"></script>
<script>
    // For receiving
    sender_id = "";
    receiver_id = "1";

    //For sending
    $(function () {      <<--  This is where the error is pointing to.
        scrolltoend();
        $('#chat-box').on('submit', function (event) {
            event.preventDefault();
            var message = $('#id_message');
            send('', '', message.val());
            message.val('');
        })
    })
</script>

</div>

上面的代码位于项目/ chat / templates / chat / chat.html中的html文件的底部，它通过{% static 'js/chat.js' %}引用chat.js，上面是aws代码行生活在cloudhere：project / static_my_proj / js / chat.js。我正在集成的代码有'materialize.js'和'materialize.min.js'这样的东西，我试图理解它们的作用。

我想知道我是否尝试将两种类型的javascript结合起来。我完全迷失了。有没有人有任何指针？我能提供哪些代码可以提供帮助吗？

由于

Answer 1

您必须添加以下行

private void initChartData(int mode) {
    chart = (LineChart) findViewById(R.id.chart);

    List<Entry> entries = new ArrayList<Entry>();
    Calendar cal = Calendar.getInstance();
    Calendar cal2 = Calendar.getInstance();
    Date today = cal.getTime();

    XAxis xAxis = chart.getXAxis();
    xAxis.setGranularityEnabled(true);
    xAxis.setGranularity(1f);
    xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);

    switch (mode) {
        case daily:

            cal2.add(Calendar.DAY_OF_MONTH, -30);
            Date thirtyDaysAgo = cal2.getTime();
            dataObjects = realm.where(AmalStat.class).greaterThan("date", thirtyDaysAgo).and().lessThan("date", today)
                    .findAll().sort("date", Sort.DESCENDING);

            Utils.logd("maxgettime: " + maxdaily);
            mindaily = dataObjects.get(dataObjects.size() - 1).getDate().getTime();
            Utils.logd("dataObjects size: " + dataObjects.size());
            int k = dataObjects.size() < 6 ? dataObjects.size() : 5;
            for (AmalStat data : dataObjects) {
                Utils.logd("time: " + data.getDate().getTime() + ", point: " + data.getPoint());
                entries.add(new Entry(data.getDate().getTime(), data.getPoint()));
                Utils.logd("k: " + k);
                if (k == 0) {
                    mindaily = data.getDate().getTime();
                    Utils.logd("min ini: " + mindaily);
                }
                k--;
            }
            rangedaily = maxdaily - mindaily;

            xAxis.setValueFormatter(new MyAxisValueFormatter(mode));
            xAxis.setLabelCount(entries.size(), true);
            break;
        case monthly:


            int month = cal.get(Calendar.MONTH) + 1;
            cal.set(Calendar.DAY_OF_MONTH, 0);
            cal.set(Calendar.YEAR, cal.get(Calendar.YEAR));
            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH));
            Date minDay = cal.getTime();

            cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
            cal.set(Calendar.YEAR, cal.get(Calendar.YEAR));
            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH));
            Date maxDay = cal.getTime();

            int year = cal2.get(Calendar.YEAR);
            maxmonthly = maxDay.getTime();
            minmonthly = minDay.getTime();
            int j = 6;
            xAxis.setLabelCount(6, true);
            for (int i = month; i >= 0; i--) {
                cal2.set(Calendar.MONTH, i - 1);
                cal2.set(Calendar.YEAR, year);
                cal2.set(Calendar.DAY_OF_MONTH, 1);
                minDay = cal2.getTime();

                cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
                cal.set(Calendar.YEAR, cal.get(Calendar.YEAR));
                cal.set(Calendar.MONTH, i - 1);
                maxDay = cal.getTime();
                SimpleDateFormat simpleDate = new SimpleDateFormat("dd/MM/yyyy");

                String minDayText = simpleDate.format(minDay);
                String maxDayText = simpleDate.format(maxDay);
                Utils.logd(minDayText + " - " + maxDayText);
                int wajibs = realm.where(AmalStat.class).greaterThan("date", minDay).and().lessThan("date", maxDay)
                        .sum("wajib").intValue();
                int muakkads = realm.where(AmalStat.class).greaterThan("date", minDay).and().lessThan("date", maxDay)
                        .sum("muakkad").intValue();
                int nonMuakkads = realm.where(AmalStat.class).greaterThan("date", minDay).and().lessThan("date", maxDay)
                        .sum("nonMuakkad").intValue();
                int point = wajibs + muakkads + nonMuakkads;
                entries.add(new Entry(cal2.getTimeInMillis(), point));
                Utils.logd("i: " + i);
                j--;
                if (j == 0) {
                    Utils.logd("ini=" + i);
                    minmonthly = cal2.getTimeInMillis();
                }
            }

            if (month < 12) {
                for (int i = 12; i > month; i--) {
                    cal2.set(Calendar.MONTH, i - 1);
                    cal2.set(Calendar.YEAR, year - 1);
                    cal2.set(Calendar.DAY_OF_MONTH, 1);
                    int wajibs = realm.where(AmalStat.class).greaterThan("date", minDay).and().lessThan("date", maxDay)
                            .sum("wajib").intValue();
                    int muakkads = realm.where(AmalStat.class).greaterThan("date", minDay).and().lessThan("date", maxDay)
                            .sum("muakkad").intValue();
                    int nonMuakkads = realm.where(AmalStat.class).greaterThan("date", minDay).and().lessThan("date", maxDay)
                            .sum("nonMuakkad").intValue();
                    int point = wajibs + muakkads + nonMuakkads;
                    entries.add(new Entry(cal2.getTimeInMillis(), point));
                    Utils.logd("i: " + i);
                    j--;

                    if (j == 0) {
                        Utils.logd("itu=" + i);
                        minmonthly = cal2.getTimeInMillis();
                    }
                }
            }
            rangemonthly = maxmonthly - minmonthly;
            xAxis = chart.getXAxis();
            xAxis.setValueFormatter(new MyAxisValueFormatter(mode));

            break;
        case annual:

            break;
    }

    xAxis.setGranularityEnabled(true);
    xAxis.setGranularity(1f);
    xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);

    Collections.sort(entries, new EntryXComparator());

    LineDataSet dataSet = new LineDataSet(entries, "Label"); // add entries to dataset
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        dataSet.setColor(getColor(R.color.white));
        dataSet.setValueTextColor(getColor(R.color.white)); // styling, ...
    } else {
        dataSet.setColor(getResources().getColor(R.color.white));
        dataSet.setValueTextColor(getResources().getColor(R.color.white)); // styling, ...
    }

    LineData lineData = new LineData(dataSet);
    chart.setDescription(null);    // Hide the description
    chart.getAxisLeft().setDrawLabels(false);
    chart.getAxisLeft().setDrawGridLines(false);

    chart.getXAxis().setDrawLabels(true);
    chart.getXAxis().setEnabled(true);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        chart.getXAxis().setTextColor(getColor(R.color.white));
    } else {
        chart.getXAxis().setTextColor(getResources().getColor(R.color.white));
    }

    chart.getAxisRight().setDrawLabels(false);
    chart.getAxisRight().setDrawGridLines(false);
    chart.getAxisRight().setDrawAxisLine(false);
    chart.getLegend().setEnabled(false);   // Hide the legend
    chart.setData(lineData);
    chart.invalidate();

    switch (mode) {
        case daily:
            Utils.logd(rangedaily + " " + maxdaily + " " + mindaily);
            chart.setVisibleXRangeMaximum(rangedaily);
            chart.moveViewToX(maxdaily);
            break;
        case monthly:
            Utils.logd(rangemonthly + " " + maxmonthly + " " + minmonthly);
            chart.setVisibleXRangeMaximum(rangemonthly);
            chart.moveViewToX(maxmonthly);
            break;
        case annual:

    }
    chart.invalidate();
    Utils.logd("akhir");
}`

上面/之前

<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

这一行

Answer 2

我认为你没有正确地声明变量。

变量，

var sender_id = "";
var receiver_id = "1";

// if you are using ES6 then

const sender_id="";
const receiver_id = "1";

应该像这样声明，

    <script>
    $(document).ready(function() {
        $('#dataTables-example').DataTable({
            responsive: true
        });
    });
    </script>

    <script>
  $( function() {
    $( "#datepicker" ).datepicker();
  } );
  </script>

除此之外，也许你应该像艾哈迈德·泽伊贝克所说的那样包括jquery。

Materialise.js和Materialize.css是materialize框架的一部分，类似于bootstrap。

Django javascript无法运行$未定义

2 个答案: